X-Git-Url: https://git.librecmc.org/?a=blobdiff_plain;f=common%2Fedid.c;h=f244d26e04be491f71cf912a9aba8c9b848c0a0f;hb=1c1ed441b0d1d7d5fbf02cf89a390c04b18f8ba3;hp=c82c298097ba855dc836c1ee20440cd79ab9ed2a;hpb=79f38777947ac7685e2cef8bd977f954ab198c0e;p=oweals%2Fu-boot.git diff --git a/common/edid.c b/common/edid.c index c82c298097..f244d26e04 100644 --- a/common/edid.c +++ b/common/edid.c @@ -1,34 +1,18 @@ +// SPDX-License-Identifier: GPL-2.0+ /* * Copyright (c) 2012 The Chromium OS Authors. * * (C) Copyright 2010 * Petr Stetiar * - * See file CREDITS for list of people who contributed to this - * project. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License as - * published by the Free Software Foundation; either version 2 of - * the License, or (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place, Suite 330, Boston, - * MA 02111-1307 USA - * * Contains stolen code from ddcprobe project which is: * Copyright (C) Nalin Dahyabhai - * */ #include #include +#include +#include #include #include @@ -46,6 +30,17 @@ int edid_check_info(struct edid1_info *edid_info) return 0; } +int edid_check_checksum(u8 *edid_block) +{ + u8 checksum = 0; + int i; + + for (i = 0; i < 128; i++) + checksum += edid_block[i]; + + return (checksum == 0) ? 0 : -EINVAL; +} + int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, unsigned int *hmax, unsigned int *vmin, unsigned int *vmax) @@ -70,6 +65,182 @@ int edid_get_ranges(struct edid1_info *edid, unsigned int *hmin, return -1; } +/* Set all parts of a timing entry to the same value */ +static void set_entry(struct timing_entry *entry, u32 value) +{ + entry->min = value; + entry->typ = value; + entry->max = value; +} + +/** + * decode_timing() - Decoding an 18-byte detailed timing record + * + * @buf: Pointer to EDID detailed timing record + * @timing: Place to put timing + */ +static void decode_timing(u8 *buf, struct display_timing *timing) +{ + uint x_mm, y_mm; + unsigned int ha, hbl, hso, hspw, hborder; + unsigned int va, vbl, vso, vspw, vborder; + struct edid_detailed_timing *t = (struct edid_detailed_timing *)buf; + + /* Edid contains pixel clock in terms of 10KHz */ + set_entry(&timing->pixelclock, (buf[0] + (buf[1] << 8)) * 10000); + x_mm = (buf[12] + ((buf[14] & 0xf0) << 4)); + y_mm = (buf[13] + ((buf[14] & 0x0f) << 8)); + ha = (buf[2] + ((buf[4] & 0xf0) << 4)); + hbl = (buf[3] + ((buf[4] & 0x0f) << 8)); + hso = (buf[8] + ((buf[11] & 0xc0) << 2)); + hspw = (buf[9] + ((buf[11] & 0x30) << 4)); + hborder = buf[15]; + va = (buf[5] + ((buf[7] & 0xf0) << 4)); + vbl = (buf[6] + ((buf[7] & 0x0f) << 8)); + vso = ((buf[10] >> 4) + ((buf[11] & 0x0c) << 2)); + vspw = ((buf[10] & 0x0f) + ((buf[11] & 0x03) << 4)); + vborder = buf[16]; + + set_entry(&timing->hactive, ha); + set_entry(&timing->hfront_porch, hso); + set_entry(&timing->hback_porch, hbl - hso - hspw); + set_entry(&timing->hsync_len, hspw); + + set_entry(&timing->vactive, va); + set_entry(&timing->vfront_porch, vso); + set_entry(&timing->vback_porch, vbl - vso - vspw); + set_entry(&timing->vsync_len, vspw); + + timing->flags = 0; + if (EDID_DETAILED_TIMING_FLAG_HSYNC_POLARITY(*t)) + timing->flags |= DISPLAY_FLAGS_HSYNC_HIGH; + else + timing->flags |= DISPLAY_FLAGS_HSYNC_LOW; + if (EDID_DETAILED_TIMING_FLAG_VSYNC_POLARITY(*t)) + timing->flags |= DISPLAY_FLAGS_VSYNC_HIGH; + else + timing->flags |= DISPLAY_FLAGS_VSYNC_LOW; + + if (EDID_DETAILED_TIMING_FLAG_INTERLACED(*t)) + timing->flags = DISPLAY_FLAGS_INTERLACED; + + debug("Detailed mode clock %u Hz, %d mm x %d mm\n" + " %04x %04x %04x %04x hborder %x\n" + " %04x %04x %04x %04x vborder %x\n", + timing->pixelclock.typ, + x_mm, y_mm, + ha, ha + hso, ha + hso + hspw, + ha + hbl, hborder, + va, va + vso, va + vso + vspw, + va + vbl, vborder); +} + +/** + * Check if HDMI vendor specific data block is present in CEA block + * @param info CEA extension block + * @return true if block is found + */ +static bool cea_is_hdmi_vsdb_present(struct edid_cea861_info *info) +{ + u8 end, i = 0; + + /* check for end of data block */ + end = info->dtd_offset; + if (end == 0) + end = sizeof(info->data); + if (end < 4 || end > sizeof(info->data)) + return false; + end -= 4; + + while (i < end) { + /* Look for vendor specific data block of appropriate size */ + if ((EDID_CEA861_DB_TYPE(*info, i) == EDID_CEA861_DB_VENDOR) && + (EDID_CEA861_DB_LEN(*info, i) >= 5)) { + u8 *db = &info->data[i + 1]; + u32 oui = db[0] | (db[1] << 8) | (db[2] << 16); + + if (oui == HDMI_IEEE_OUI) + return true; + } + i += EDID_CEA861_DB_LEN(*info, i) + 1; + } + + return false; +} + +int edid_get_timing_validate(u8 *buf, int buf_size, + struct display_timing *timing, + int *panel_bits_per_colourp, + bool (*mode_valid)(void *priv, + const struct display_timing *timing), + void *mode_valid_priv) +{ + struct edid1_info *edid = (struct edid1_info *)buf; + bool timing_done; + int i; + + if (buf_size < sizeof(*edid) || edid_check_info(edid)) { + debug("%s: Invalid buffer\n", __func__); + return -EINVAL; + } + + if (!EDID1_INFO_FEATURE_PREFERRED_TIMING_MODE(*edid)) { + debug("%s: No preferred timing\n", __func__); + return -ENOENT; + } + + /* Look for detailed timing */ + timing_done = false; + for (i = 0; i < 4; i++) { + struct edid_monitor_descriptor *desc; + + desc = &edid->monitor_details.descriptor[i]; + if (desc->zero_flag_1 != 0) { + decode_timing((u8 *)desc, timing); + if (mode_valid) + timing_done = mode_valid(mode_valid_priv, + timing); + else + timing_done = true; + break; + } + } + if (!timing_done) + return -EINVAL; + + if (!EDID1_INFO_VIDEO_INPUT_DIGITAL(*edid)) { + debug("%s: Not a digital display\n", __func__); + return -ENOSYS; + } + if (edid->version != 1 || edid->revision < 4) { + debug("%s: EDID version %d.%d does not have required info\n", + __func__, edid->version, edid->revision); + *panel_bits_per_colourp = -1; + } else { + *panel_bits_per_colourp = + ((edid->video_input_definition & 0x70) >> 3) + 4; + } + + timing->hdmi_monitor = false; + if (edid->extension_flag && (buf_size >= EDID_EXT_SIZE)) { + struct edid_cea861_info *info = + (struct edid_cea861_info *)(buf + sizeof(*edid)); + + if (info->extension_tag == EDID_CEA861_EXTENSION_TAG) + timing->hdmi_monitor = cea_is_hdmi_vsdb_present(info); + } + + return 0; +} + +int edid_get_timing(u8 *buf, int buf_size, struct display_timing *timing, + int *panel_bits_per_colourp) +{ + return edid_get_timing_validate(buf, buf_size, timing, + panel_bits_per_colourp, NULL, NULL); +} + + /** * Snip the tailing whitespace/return of a string. * @@ -139,7 +310,7 @@ static void edid_print_dtd(struct edid_monitor_descriptor *monitor, h_total = h_active + h_blanking; v_total = v_active + v_blanking; - if (v_total * h_total) + if (v_total > 0 && h_total > 0) vfreq = pixclock / (v_total * h_total); else vfreq = 1; /* Error case */